Tachometer.



A. ALLEMANN.

TAC'HOMETER. nrrupmou FILED JUNE 10. ms.

Patented Apr 13, 1915,

THE I'VORRIS PEYERS CO., PH01U LIIHO,. WASHINGTON. l1 C.

ARNOLD ALLEMANN, F BERNE, SWITZERLAND. ASSIGNOR TO FIRMA SCHWEIZ,

KOMMISSIONS- UNI) AUFIBEWAHRUNGS-HAUS Fill? DAS IN- UN D AUSLAND TOMASCI-I- POLSKY & WEIDENFELD, OF BERNIE SWITZERLAND, A CORPORATION OF SWITZER- LAND.

TACHOMETER.

matinee.

Specification of Letters Patent.

Patented Apr. 1L3, 111L915,

To all whom it may concern:

Be it known that l, ARNOLD ALLEMANN,

. a citizen of the Swiss Confederation, and

residing at Berne, Switzerland, have invented certain new and useful Improvements in Tachometers, of which the following is a specification.

My invention relates to a known type of tachometer, and a primary object is to provide a device combined therewith for indicating the instantaneous speed of a vehicle by numerals.

Une embodiment of my invention is represented by way of example in the accompanying drawing, wherein Figure 1 is a rear elevation showing part of a tachometer comprising my device, and Fig. 2 is a top plan view thereof.

The tachometer comprises a camdisk 50 which is driven in any known manner by a slide, not shown, by means of the gear wheels 53, 54 and the axle 55, the operative faces of the cams of the said cam-disk being designated a, .7), c, d and 6. Near the axle of this disk 50 and located rather lower than the same is a pivot 56 mounted in the plate 2; this pivot carries a number of indicating disks 57, of which the outside one is provided, for example, with a cross, while the others are marked in order with numbers 10, 20, 30, 40 indicating kilometers. This indicating device can of course be arranged for indicating other speeds as desired. The periphery of each of these disks is guided between guide-plates 58 and a projection 57 of each disk projects into the path of a cam of the cam disk 50. The ratio of transmission between the latter and the slide above referred to, is such that when the pointer of the tachometer indicates for instance the speed of 10 kilometers, the outside disk 57 is lifted by the cam face a; of the cam-disk 50 into the position in which it is shown in Fig. 1, so that the number 10 is entirely visible on the next disk. In the same manner another indicating disk will be completely exposed to view when the pointer has sufficiently progressed to point to another complete ten. As the speed decreases the indicating disks automatically return under the influence of gravity to their initial position. In the raised position of the in dicating disks the largest part of the periphery of the cam-disk coacts with the raised disks 57 and locks them in this position.

I claim In combination with a tachometer a mechanism for indicating the momentary speed of vehicles and the like, comprising a rotated plural cam-disk, a pivot, and a plurality of indicating disks loosely mounted on said pivot, each indicating disk having a projection adapted to be engaged by one of the cam-faces of said cam-disk to be moved thereby out of its normal position, said cam disk being able to hold the indicating disks in their relative positions.

In testimony whereof I afix my signature in the presence of two witnesses.

ARNOLD ALLEMANN.

Witnesses FRIEDRICH NAnesrn, FRIEDRICH MONING.

' topics of this patent may be obtained. for five cents "each, by addressing the Commissioner of Patents,

Washington, D. C. 

